Won these at auction, (3) GC-17A and (1) each of GCMS-QP5000, GCMS-QP5050A.

Thinking about restoring one or parting them out. I imagine myself looking at wine for adulterants or something. I have no idea really, and barely know what they do. No software or manuals. A project or fools errand. I've been repairing test equipment from this era.

Any advice, recommendations?

Thanks